For what it's worth, the Shadow Conspiracy novelization by Jason Fry makes it clear that the Falleen on Mustafar is just a vigo and not the head of the whole thing. Plus, Maul remembers when he crippled Black Sun ten(ish) years prior, which is fun. The novel is really great. Even further history on the whole Mandalorian/New Mandalorian/Death Watch thing. Speaking of which, I was surprised by how much of that "New Mandalorian" talk made it into the episode. Rather than sticking to the initial "Oh, we Mandalorians are a peaceful people. We have been for a very long time. I don't know what else you heard", they actually seemed to acknowledge that the New Mandalorians are a newer concept that "True" Mandalorians see as a failure. It was almost like the show was helping those trying to make the Mando-retcons. Go figure.